Is it more beneficial to have the exit flange of the downpipe 3" and keep that diameter all the way through the exhaust system? Or is a 3" entry with 2.5" outlet and cat back exhaust the remainder of the way ok enough?
Really depends on the setup. A single 2.5" exhaust will flow less than a 2.5" dual exhaust. Also, you still need back pressure on a daily driven street car. But on a drag car, your exhaust is only as good as the most restrictive part.
Well based on the mods I have planned, a 2.5" downpipe exit and cat back exhaust should be fine. I don't plan to intercool my car or run smaller than a 3" SC pulley. Basic tune, CAI, exhaust and undersized pulleys are what I have in mind. I asked about the 3" all the way through just to see if there were any additional benefits
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